End of first trimester ?

Question

Is the end of first trimester at the start  of 13 weeks or 14?

Answer

I believe end of 12th, beginning of 13th is the start of the second trimester.

Answer

Trimester = 3 months = 12 weeks, so week 13 is considered 2nd trimester

Answer

My doc says start of week 13.

Answer

My doctor says start of week 13 as well.

Answer

Start of week 14

Answer

40 wks divided by 3 is 13.3 if you wanna get REALLY technical ?

Answer

Yeah it's like nobody really knows for sure . Some doctors and internet say 13 and others say 14

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